(I know, I'm working with quite the jumble of languages, it seems.)Any Hebrew speakers out there who could help me translate (and perhaps speak) some phrases?I've tried converting Hebrew script (from Google Translate) into the Roman alphabet, but, me not having a knowledge of it, I don't know what vowels go where. In addition: has Hebrew changed much from ancient times to today? If so, how?

Hebrew has changed substantially. Not so much as a natural progression (as in the modern Arabic 'dialects' compared to Classical [Quranic] Arabic, which have indeed changed substantially as well), but as an abrupt shift with the revival of Modern/Israeli Hebrew. Modern Hebrew is a modernized form of Biblical Hebrew, with substantial changes in vocabulary as well as some changes in pronunciation and grammar. Some have gone as far as to say it's really a European language with Hebrew words, but that's an extreme claim in my opinion. It's just modernized Hebrew, and it also does have some of the features that naturally evolved in Hebrew (changing pronunciation, some grammar) but remember that Hebrew as a native/spoken language was dormant for some time, and instead only known/used as a liturgical/religious language for centuries. Of course many Hebrew speakers will know both Modern Hebrew and Biblical Hebrew, at least to some degree, for cultural reasons, certainly compared to say how many English speakers know Old English.

As for translators, I hope you find someone to talk to about these topics.

I don't know Hebrew (or Irish) myself, but for transliteration, there are some websites out there that will do it for you-- not perfectly, but at least the basic idea. There are also a lot of tools available for biblical research, which might help you in general (whether or not your project is primarily religious in nature). Search around a bit and see what's out there. I don't know much about Hebrew on Google Translate, but my guess is that like Greek it is probably the modern version-- Ancient Greek often translates into English somewhat intelligibly, but the translation into Greek is almost always Modern Greek. The same probably applies to Hebrew, so I hope at least knowing that is helpful even if it means Google Translate won't help you much.